rpm-build/scripts/process-debuginfo.in

#!/bin/sh -efu
#
# Process single file for debuginfo business.
# (Will be run multiple instances in parallel.)
#
# Copyright (c) 2020 Vitaly Chikunov <vt@altlinux.org>. Based on brp-debuginfo
# written by Alexey Tourbin <at@altlinux.org>.  Based on find-debuginfo.sh
# by Jeff Johnson <jbj@rpm5.org> and Roland McGrath <roland@redhat.com>.
# License: GPLv2+.

. @RPMCONFIGDIR@/rpmb-functions
ValidateBuildRoot

cd "$RPM_BUILD_ROOT"

mkdir -p .tmp

f=$1
rezip=
elfcompress=
strip_rel=
strip_btf='--keep-section=.BTF'
strip='--strip-all'

if [ -z "${f#./lib/modules/*.ko}" ]; then
	elfcompress=yes
	strip_rel="--reloc-debug-sections"
elif [ -z "${f##./lib/modules/*.ko.*}" ]; then
	ext=${f##*.}
	unzip=
	rezip=
	case "$ext" in
		gz)
			unzip='gzip --force --decompress'
			rezip='gzip --force'
			;;
		xz)
			unzip='xz --force --decompress'
			rezip='xz --check=crc32 --lzma2=dict=1MiB --force'
			;;
		zst)
			unzip='zstd --quiet --force --rm --decompress'
			rezip='zstd --quiet --force --rm'
			;;
	esac
	# Compressed module: uncompress it, and work with uncompressed one.
	$unzip "$f"
	f="${f%.*}"
	elfcompress=yes
	strip_rel="--reloc-debug-sections"
elif [ -z "${f##./boot/vmlinuz-*}" ]; then
	# Compressed kernel: trigger extraction of vmlinux from the source.
	kver=${f#./boot/vmlinuz-}
	vmlinuxs=$(find "$RPM_BUILD_DIR" -depth -maxdepth 4 -type f -name vmlinux -print -quit)
	vmlinuxd=./usr/lib/debug/lib/modules/$kver/vmlinux

	if [ -f "$vmlinuxs" ]; then
		install -pD -m644 "$vmlinuxs" "$vmlinuxd"
		f=$vmlinuxd
		strip=
	else
		Warning "vmlinux not found in $RPM_BUILD_DIR for -debuginfo"
		exit
	fi
else
	# Non-kernel binaries
	strip_btf=
fi

debugf=./usr/lib/debug${f#.}.debug
for pat in ${RPM_BRP_STRIP_DEBUG-}; do
	if [ -z "${f##.$pat}" ]; then
		strip='--strip-debug'
		break
	fi
done
for pat in ${RPM_BRP_STRIP_NONE-}; do
	if [ -z "${f##.$pat}" ]; then
		strip=
		break
	fi
done

timestamp=$(date --iso-8601=ns --reference="$f")
debugedit -b "$RPM_BUILD_DIR" -d /usr/src/debug -l .tmp/src.$$ "$f"
if [ ! -s .tmp/src.$$ ] && [ -x /usr/bin/eu-elfcompress ]; then
	# debugedit has failed to extract sources list, possibly
	# due to ELF compression - uncompress and try again.
	LD_ORIGIN_PATH=/usr/bin eu-readelf -S "$f" > .tmp/sections.$$
	if grep -q ' \.debug_info .* PROGBITS .*C' .tmp/sections.$$; then
		# Have SHF_COMPRESSED flag.
		zmode=zlib-gabi
	elif grep -q ' \.zdebug_info .* PROGBITS ' .tmp/sections.$$; then
		zmode=zlib-gnu
	else
		zmode=
	fi
	rm .tmp/sections.$$
	if [ -n "$zmode" ]; then
		LD_ORIGIN_PATH=/usr/bin eu-elfcompress --type=none "$f"
		debugedit -b "$RPM_BUILD_DIR" -d /usr/src/debug -l .tmp/src.$$ "$f"
		LD_ORIGIN_PATH=/usr/bin eu-elfcompress --type=$zmode "$f"
	fi
fi
if [ -n "$strip" ]; then
	mkdir -p "${debugf%/*}"
	LD_ORIGIN_PATH=/usr/bin eu-strip $strip $strip_rel $strip_btf --remove-comment -f "$debugf" "$f"

	if [ -n "$elfcompress" ] && [ -x /usr/bin/eu-elfcompress ]; then
		LD_ORIGIN_PATH=/usr/bin eu-elfcompress --quiet "$debugf"
	fi

	touch --date=$timestamp "$debugf" "$f"
	chmod 644 "$debugf"
else
	touch --date=$timestamp "$f"
fi

mkdir -p .debuginfo/src/"${f%/*}"
awk 'BEGIN{RS="\0";ORS="\n"}{print}' .tmp/src.$$ |LC_ALL=C sort -u |
while read -r src; do
	if [ -f "$RPM_BUILD_DIR"/"$src" ]; then
		if [ ! -f ./usr/src/debug/"$src" ]; then
			install -pD -m644 "$RPM_BUILD_DIR"/"$src" ./usr/src/debug/"$src".$$
			mv -f ./usr/src/debug/"$src".$$ ./usr/src/debug/"$src"
		fi
	elif [ -d "$RPM_BUILD_DIR"/"$src" ]; then
		mkdir -p ./usr/src/debug/"$src"
	else
		continue
	fi
	printf '%s\n' /usr/src/debug/"$src"
done >.debuginfo/src/"$f"
[ -s .tmp/src.$$ ] || printf '%s\n' "$f" >> .tmp/no_debug_info
rm .tmp/src.$$

if [ -n "$rezip" ]; then
	$rezip "$f"
fi